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Fiona White Physiology & Anatomy Hormones in Reproduction Find out about the hormones involved in Birth & Lactation. For each one, state where it is secreted from and what its effects are. Describe whether the mechanisms involved are negative or positive feedback. There are several different hormones that influence the female reproductive system and the two most fundamental hormones are progesterone and oestrogen. Progesterone is a steroid hormone and has a number of physiological effects on the body such as normalising blood clotting and vascular tone, zinc and copper levels, cell oxygen levels, and the use of fat stores for energy and it also assists in the thyroid function. It is usually required to normalise or restore changes caused by oestrogen. It affects all aspects of pregnancy, prepares breasts for lactation and the relaxation of joints and ligaments in preparation of childbirth. It can affect bowel movements usually causing constipation and back pain and...

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